Process of purifying salt recovered from spent soap-lyes



(No IQIodel)l I I l A. DOMEIER 8v 0.. C. VHAG]'|1V[].\T1\. v

PRGBSS 0F PURI-FYING SALT REOVERED PROM SPENT SOAP LYBS.

10.413.616- Patented Oct. 22, 1889.

To a/ZZ whomv it may concern: Be itknown that we,-ALBERT DoMEIER, l merchant, and OTTo CHRISTIAN HAGEMANN,

mechanical engineer, both of London, Engf' land, have invented a new and useful Process l of Washing or 'Purifying the Salt Recovered l. from Spent Soap-Lye During theManufacture of Crude Glycerine therefrom, of which the following ris a Specification i during the concentration of Soap-lye for the manufacture of crude glycerine and in the distillation of such crude glycerine iscontaminated with thelye or crude glycerine as an impurity; andthe object of this invention is to recover such lye or glycerine from said Salt and at the same time free the salt from these impurities and render it clean and merchantable and lit for use again in the manufacture of soap. v

In carrying'- out our process we mayv make use of the improved apparatus shown inthe accompanying drawings, whichA process we will describe in connection with the description of said apparatus; but said apparatus -willV form the subject-matter of another apu plication for Letters Patent.

.I A B C D E F are small tanks or tubs placed ata higher elevation than cylinder G, within 3o which latter is journaled a vertical rotatable .i shaft l-I is revolved by means of gearing J in l order to mix the contents of cylinder G.

K is a false bottom of the nature of a sieve, composed of a perforated metal plate covered with wire-gauze orcan vas, or both. A second perforated plate may be placed `on top of the l" f gauze or cloth for protection of same from i .i Y i abrasion. Below the level of the sieve is 4o placed a closedv cylinder or vessel L, which y communicates with cylinder G by la pipe N, tted with a valve n, and a lbranch pipe O therefrom, also fitted with a valve o, leads -to an air-pump P, capable of producing air pressure or vacuum in cylinder L. Another branch pipe Q communicates also with cylinder L. A pipe R,'iitted with valve S, leads from the bottom of cylinderL to top of tanks A F, with a .valve over each tank, as shown. Cylinders AF communicate with the mainv pipe T, leading to top of cylinder G.

The salt which is thrown outof solution shaft H, having blades or mixers l I. The' PATENT OFFICE.

'ALBERT DOMEIERZAND oLTo CHRISTIAN IIAcEnANN, or LoNDoN, ENGLAND,

AsSIcNoRs To JAMES s. KIRK a co., or oHIcAco, ILLINOIS.'

Processor PURIFYING SALT REcovERrD FROM SPINT soAP-LYES.

SPECIFICATION formingpart of Letters Patent No. 413,616, dated October 22, 1889.

Application filed December v21, 1888. Serial No. 294,307. (No Specimens.)

V is a door to cylinder G for the purpose of taking out the purified salt. i

A branch pipe W, fitted with a valve X, as shown, leads to a Store-tank, referred to hereforcing in air by means of 'pump P through the pipe O. The cylinder L is then exhausted Y by the air-pump P, and at the Same time valve N is opened (the other valves being closed) and the glycerine or lye adhering to the salt for the most part drawn through pipe M into cylinder L. Valve N is then closed and valve X opened, and theglycerine or lye forced to store-tank through pipe W by means of air-pressure from pump P. Y The vessels A F are charged with a Saturated aqueous solution of common salt. The lower valve of tankA is opened and the solution allowed to flow into the salt in cylinder G. The Whole is then mixed together by mixers I. yValve N is then opened and the liquor drawn into cylinder L by means of the airpump P. Valve N is then closed and valve X opened, and the liquor forced by means of the pump P through pipe W to the storetank. The liquor from B is now allowed to flow down to the salt in cylinder G and mixed with the Saltth erein,the valve N againopened, and the liquor drawn into cylinder L by the pump. The valve S is then opened and the liquor in L forced up into cylinder or vessel AA. The liquor from C isnow allowed to iiow down into the salt in cylinder G, the shaft again revolved to mix the mass, the valve N again opened, and the liquor drawn into cylinder L by the pump. The valve S is then opened and the liquor forced up into cylinder B. The Same operation is repeated with the liquor in each of the cylinders D, E, and

F, finally leaving cylinder F empty. This isV recharged with more of the solution of salt, which is allowed vto flow down into the salt in cylinder G, mixed therewith, drawn into cylinder L, and forced therefrom into cylinder F. Air is now drawn 'through the Salt in cylinder G until it is dry, or nearly so, when IOO door Vis opened and the purified salt removed.

The foregoing describes the operation on the first batch of salt Worked or purified in the apparatus. In the case of succeeding batches the operations are the same, theliquor from A, after being used to purify the salt, being forced direct into store-tank through pipe W, the liquor from B being (after use on the salt in the same way) forced into A, C into B, D into C, E into D, and F into E, leaving F empty to receive the last or finishing charge of solution of salt. It will thus be seen that the salt receives six successive purifications by solutions of salt, finishing always with a fresh charge of such solution, but only using one fresh charge for every batch of salt, resulting in economy of labor, as each charge of the aqueous solution is used a number of times (being entirely effective in repeated use) and requiring less evaporation in the filial process than does the method where each charge of the solution is used only once.

We do not confine ourselves to the number of such purifications, as in some instances two or three are sufficient; but we have found of successive washings with such saltingpoint liquor, and, finally, one with pure brine. The lye or glycerine adhering to the salt when first placed in cylinder G is taken up or dissolved therefrom by the saturated solution of salt, (which will dissolveV lye or glycerine, but, being already saturated with salt, is incapable of dissolving any more salt,) which becomes richer in lye or glycerine at each successive time of using, and eventually finds its way into the store-tank so described. At the same time the 'salt is thoroughly cleansed from adherent impurities by the successive treatments with solution of salt, being finally dried by the passage of air through it, as described, and rendered merchantable and fit for nearly everypurpose for which salt is used.

We claim- The herein-described process of purifying salt recovered from spent soap-lye during concentration or the manufacture of crude glycerine therefrom, which consists in subjecting a convenient quantity of the salt to a series of Washings with separate charges of a saturated aqueous solution i of salt, said charges containing decreasing quantities of glycerine in solution, the first of said charges being drawn off with its dissolved glycerine and a fresh charge of a saturated solution of salt free of glyceriue added to the series in lieu thereof foreach quantity of salt treated,

said fresh charge being used for final treatment, whereby each quantity of salt is subjected to repeated washings and the separate charges of the solution are utilized repeatedl Y. v

5 ALBERT DOMEIER.

OTTO CHRISTIAN HAGEMANN. Witnesses:

MARTIN B. WALLER,

U. S. Vce-Consul-General, London. A. G. MossARD.

1151s hereby eertineiheiiietters Petent Ne.- 413,616, greeted oeteber 22,1889, upon i the application of Albert Domeier andOtto Christian Hagemann, of London, England, for an improvement in the Process of Purifying Salt Recovered from Spent Soap-Lyes, l

Was erroneously issued to' James S. Kirk & Co. as sole owners of the said invention;

that said Letters Patent should have been issued to said Albert Doineiei" and James S.

Kirk de Oo. jointly, each being owner of one-half interest, asl shown by the record of assignments in this O fee; and that said Letters Patent shonld be read With this oorreotion therein that the same may conform to the record ofthe oase in the Patent Office.

Signed, oountersigned, and sealed this 5th day of November, A. D. 1889.

[SEAL] e GYRUS BUSSEY,

Assistant Secretary ofthe Interim'. Gountersigned G. E. MITCHELL,

Coinmissionei` of Patents. 

